UUID Studio

UUID Studio

Regex Tester

Test JavaScript RegExp patterns.

  • đź”’ No data stored or uploaded
  • ⚡ 100% client-side
  • 🆓 Free, no account
Click Convert when ready

Override only when Auto cannot parse your paste. Changing this loads a matching sample into Input — click Convert to run. Use Load sample to cycle every format example.

All conversions

Read-only representations of the same 16 bytes. Every textual form is listed here, not in “Prefer format”.

Paste two values: if both sides are valid JSON, a structural diff appears; otherwise UUID / bytes are compared when both decode to the same format.

A
B

Create or edit JSON here (syntax colors), then format, validate, or convert - same as MongoDB $binary UUID blobs on the Convert tab once detected.

New document

Hash, HMAC, AES-GCM/CBC + RSA-OAEP, codecs, JWT decoding, UUID v4, and secure random - all client-side. JWTs use Base64URL (three segments), not a single MIME Base64 block - use Decode JWT below, not raw Base64 decode.

Examples

  • Email-ish 
    [\w.+-]+@[\w.-]+\.[a-z]{2,}

About Regex Tester

Regular expressions are notoriously hard to read back after the fact - including your own, a week later. Testing a pattern against real sample text before committing it to code catches mistakes early.

Enter a pattern and flags, see matches highlighted against your input immediately, using the exact same RegExp engine your browser's JavaScript runs - so behavior matches what you'll actually get in production, not some other regex flavor.